Is Iodine-123 metaiodobenzylguanidine Safe in Breastfeeding

I am a breastfeeding mother and i want to know if it is safe to use Iodine-123 metaiodobenzylguanidine? Is Iodine-123 metaiodobenzylguanidine safe for nursing mother and child? Does Iodine-123 metaiodobenzylguanidine extracts into breast milk? Does Iodine-123 metaiodobenzylguanidine has any long term or short term side effects on infants? Can Iodine-123 metaiodobenzylguanidine influence milk supply or can Iodine-123 metaiodobenzylguanidine decrease milk supply in lactating mothers?

Information in this record refers to the use of Iodine-123 metaiodobenzylguanidine (I 123 meta-iodobenzylguanidine; I 123 MIBG) as a diagnostic agent. The United States Nuclear Regulatory Commission states that breastfeeding should be interrupted after administration of I 123 MIBG to a nursing mother. The duration of breastfeeding interruption depends on the dose administered (see table).[1][2] These values apparently refer to uncontaminated I 123. With contamination of I 124 or I 125, the interruption period is longer. The International Commission on Radiological Protection states that breastfeeding should be interrupted for more than 3 weeks following diagnostic use of sodium iodide I 123. This usually will result in permanent discontinuation of breastfeeding for this infant.[3] During the period of interruption, the breasts should be emptied regularly and completely. If the mother has expressed and saved milk prior to the examination, she can feed it to the infant during the period of nursing interruption.[4][5][6] The milk that is pumped by the mother during the time of breastfeeding interruption can either be discarded or stored refrigerated and given to the infant after 10 physical half-lives, or about 5.5 days, have elapsed. Mothers concerned about the level of radioactivity in their milk could ask to have it tested at a nuclear medicine facility at their hospital. When the radioactivity is at a safe level she may resume breastfeeding. A method for measuring milk radioactivity and determining the time when a mother can safely resume breastfeeding has been published.[7]

Dose	Duration of Interruption
400 MBq (10.8 mCi)	48 hours[2]
370 MBq (10 mCi)	24 hours[1]
150 MBq (4 mCi)	12 hours[1]